A wide temperature range air source heat pump system with electric vehicle charging pile

Abstract

The utility model discloses a wide temperature range air source heat pump system with an electric vehicle charging pile, the system includes a gas engine, a compressor, a condenser, an evaporator and a generator, the compressor and the generator are respectively connected to the gas engine, the compressor and the generator are driven by the gas engine to work, the refrigerant output end of the compressor is connected to the condenser, the output end of the condenser is connected to the evaporator, and the output end of the evaporator is connected to the refrigerant input end of the compressor. The utility model can utilize the idle period of the wide temperature range air source heat pump, and can even be equipped with a large standby power engine, while ensuring cooling / heating, providing DC fast charging for new energy electric vehicles or power battery packs that need to be charged. The use of this new wide temperature range air source heat pump system with a DC charging pile can not only save the investment cost of newly built city power charging pile equipment, but also solve the problems of insufficient grid capacity, site restrictions, power shortages, etc. The DC fast charging provided can better realize the fast charging function.

Description

Technical Field

[0001] The utility model discloses a wide temperature range air source heat pump system, in particular a wide temperature range air source heat pump system with an electric vehicle charging pile, which belongs to the fields of heat pump technology and direct current charging technology, and is a new wide temperature range air source heat pump system that can provide cooling / heating air conditioning needs and can provide DC350-560V direct current fast charging for electric vehicles or power battery packs. Background Art

[0002] At present, with the popularization of new energy electric vehicles in China, high-power fast charging has become the mainstream trend of consumer demand. However, more public charging piles and private charging piles on the market use the slow charging mode of AC power, while the coverage rate of DC fast charging piles is very low. With the further marketization of the charging pile industry, the charging profit model is expected to be richer. Coupled with the limitation of the capacity of the grid coverage area, the use of DC fast charging will have a large number of application markets. Heat pump units driven by gas engines have been widely used in many office buildings, commercial real estate, factories, property communities and other fields. These heat pump units are installed and arranged in outdoor areas, and the application places cover parking areas. In addition to heating in winter and cooling in summer, wide temperature range air source heat pumps have 5-8 months of seasonal equipment idle period each year. Summary of the invention

[0003] In view of the above-mentioned disadvantage that the wide temperature range air source heat pump in the prior art has idle periods of different lengths each year, causing waste, the utility model provides a wide temperature range air source heat pump system with an electric vehicle charging pile, which can use the excess energy or idle period of the wide temperature range air source heat pump to drive a generator set to generate electricity and supply power to the new energy vehicle charging pile.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a wide temperature range air source heat pump system with an electric vehicle charging pile, the system includes a gas engine, a compressor, a condenser, an evaporator and a generator, the compressor and the generator are respectively connected to the gas engine, the compressor and the generator are driven to work by the gas engine, the refrigerant output end of the compressor is connected to the condenser, the output end of the condenser is connected to the evaporator, and the output end of the evaporator is connected to the refrigerant input end of the compressor.

[0005] The technical solution adopted by the utility model to solve its technical problems further includes:

[0006] The generator and the compressor are connected in series, and the generator is connected between the compressor and the gas engine.

[0007] The generator is a permanent magnet generator.

[0008] The condenser adopts a plate heat exchanger or a tube-fin heat exchanger.

[0009] The evaporator adopts a plate heat exchanger or a tube-fin heat exchanger.

[0010] An electronic expansion valve is connected between the condenser and the evaporator.

[0011] The cooling water system of the gas engine is connected with a waste heat recovery heat exchanger.

[0012] The heat exchange water outlet of the condenser is connected to the water inlet of the waste heat recovery heat exchanger.

[0013] The exhaust outlet of the gas engine is connected to a flue gas heat recovery device, the water outlet of the flue gas heat recovery device is connected to the water inlet of the cooling water system of the gas engine, and the water inlet of the flue gas heat recovery device is connected to the water outlet of the waste heat recovery heat exchanger.

[0014] The water outlet of the waste heat recovery heat exchanger is also connected to the cooling water inlet of the generator, and the cooling water outlet of the generator is connected to the cooling water inlet of the gas engine.

[0015] The beneficial effect of the utility model is that the utility model can utilize the idle period of the wide temperature range air source heat pump, and can even be equipped with a large standby power engine, while ensuring cooling / heating, providing DC fast charging for new energy electric vehicles or power battery packs that need to be charged. The use of this new wide temperature range air source heat pump system with DC charging pile can not only save the investment cost of newly built municipal power charging pile equipment, but also solve the problems of insufficient grid capacity, site restrictions, power shortage, etc. The DC fast charging provided can achieve a faster charging function.

[0016] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the principle diagram of the wide temperature range air source heat pump heating mode system of the utility model.

[0018] Figure 2 This is the principle diagram of the wide temperature range air source heat pump refrigeration mode system of the utility model.

[0019] Figure 3 This is the principle diagram of the wide temperature range air source heat pump heating / charging mode system of the utility model.

[0020] Figure 4 This is the control logic diagram of the wide temperature range air source heat pump air conditioning / charging system of the utility model. DETAILED DESCRIPTION

[0021] This embodiment is a preferred implementation mode of the utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the utility model.

[0022] Please refer to the attached Figure 1 To Attachment Figure 4 The utility model mainly includes a gas engine, a compressor, a condenser, an evaporator and a generator. The compressor and the generator are respectively connected to the gas engine, and the compressor and the generator are driven by the gas engine to work. The refrigerant output end of the compressor is connected to the condenser, the output end of the condenser is connected to the evaporator, and the output end of the evaporator is connected to the refrigerant input end of the compressor.

[0023] In this embodiment, the generator and the compressor are connected in series, and the generator is connected between the compressor and the gas engine.

[0024] In this embodiment, the generator is a permanent magnet generator.

[0025] In this embodiment, the condenser adopts a plate heat exchanger or a tube-fin heat exchanger; the evaporator adopts a plate heat exchanger or a tube-fin heat exchanger.

[0026] In this embodiment, an electronic expansion valve is connected between the condenser and the evaporator to control the flow rate of the refrigerant in the pipeline.

[0027] In this embodiment, a waste heat recovery heat exchanger is connected to the cooling water system of the gas engine for recovering waste heat generated by the cooling water system of the gas engine to provide domestic hot water or to perform secondary heating of heating water.

[0028] In this embodiment, the heat exchange water outlet of the condenser is connected to the water inlet of the waste heat recovery heat exchanger. The heating water can be heated once by the condenser and then heated again by the waste heat recovery heat exchanger.

[0029] In this embodiment, a flue gas heat recovery device is connected to the exhaust outlet of the gas engine, which can be used to recover the heat in the exhaust gas discharged from the gas engine. The water outlet of the flue gas heat recovery device is connected to the water inlet of the cooling water system of the gas engine, and the water inlet of the flue gas heat recovery device is connected to the water outlet of the waste heat recovery heat exchanger.

[0030] In this embodiment, the water outlet of the waste heat recovery heat exchanger is also connected to the cooling water inlet of the generator, and the cooling water outlet of the generator is connected to the cooling water inlet of the gas engine.

[0031] The utility model can provide a new wide temperature range air source heat pump system that can provide both air conditioning cooling / heating needs and DC charging. It is mainly composed of two major system functional modules. The first system is an air source heat pump that uses a gas engine to drive an open compressor to complete the refrigerant circulation, so as to cool in summer and heat in winter. Its cooling and heating working methods are the same as those of conventional wide temperature range air source heat pumps. The second system is the main part of the utility model, which is to install an integrated permanent magnet generator in series between the engine and the compressor pulley. The motor controller IPU is integrated with the generator with a compact structure, so that the layout and structural size of the original heat pump will not change much. A DC charging device equivalent to the engine power can be added to achieve cooling / heating while providing fast and high-power charging needs for the battery pack of new energy electric vehicles.

[0032] The entire equipment system in this utility model is composed of six major unit systems, including the engine control system ECU, the DC generator control system IPU, the wide temperature range air source heat pump control system GCU, the unit's own battery pack control system BMS, the external charging power battery pack control system BMS and the whole machine control system RCU. All systems are centered on the whole machine controller RCU and realize mutual information data sharing and CAN control through CAN communication. The control logic of this utility model includes the following:

[0033] (1) Single cooling / heating air conditioning operation control logic:

[0034] The heat pump controller GCU receives the start-up signal command from the air conditioning control panel on the user side, first detects that the performance and monitoring data of the solenoid valve, stepper motor, and expansion valve on the pipeline are within the normal range, and sends the start command to the whole machine controller RCU through the CAN message. The RCU controls the operation of the unit cooling water pump and sends the start command CAN message to the ECU to start the gas engine. After the gas engine is running, the GCU controls the engagement of the two clutches according to the air conditioning heat pump control logic, thereby controlling the compressor to compress the refrigerant and exchange heat / cold with the air, engine flue gas, and cylinder jacket water waste heat, and provide the cooling or heating needs to the user side.

[0035] Since the idling of the motor will generate back electromotive force, the RCU sends a command to the motor controller IPU, so that the motor can overcome the back electromotive force at different speeds to charge the power battery pack of the unit with a small current. When the SOC sent by the power battery pack BMS reaches more than 95%, the RCU sends a command to the motor controller IPU to output a positive torque within 20N.m to control the motor to work on the gas engine with a small load. When the SOC is lower than 50%, it switches to the charging state, and repeats this process to maintain the motor running with a small load.

[0036] (2) Single DC charging operation control logic:

[0037] After the whole machine controller RCU detects that a new power battery pack or electric vehicle is connected to the system, it cuts off the system's own battery pack power line. The power battery pack BMS sends the SOC status and battery pack parameter information to the RCU through CAN communication. The RCU first controls the water pump to run, and then starts the engine. According to the parameters of the charged battery pack, the RCU sends the target voltage to the IPU through CAN communication. The IPU adjusts the output voltage of the generator to the rated voltage of the power battery pack. According to the engine speed / torque curve table in the single charging mode calibrated in the RCU, combined with the SOC status, the engine is operated in the best economy and emission area, and the target torque value is sent to the IPU, so that the external battery pack can be quickly charged through the generator.

[0038] Since the air conditioning heat pump is in standby mode and not running, the clutch of the compressor is in a disengaged state and the engine does not work on the compressor.

[0039] (3) Air conditioning + DC charging operation control logic:

[0040] When the system is in the air-conditioning load operation state, the whole machine controller RCU detects that a new power battery pack or electric vehicle is connected to the system. The system follows the charging operation control logic. The RCU collects the speed and torque of the engine ECU under the current operating state according to the information sent by the battery pack BMS, and calculates the reserve torque at the current engine speed combined with the SOC state according to the engine speed / torque curve table. The target torque value is sent to the IPU to charge the external battery pack. The RCU always controls the actual torque value not to exceed 90% of the maximum torque in the speed / torque curve to ensure the reliability of the engine operation.

[0041] When the system is in the DC charging state, the whole machine controller RCU detects the start-up operation instruction of the heat pump air conditioner GCU and sends a signal to the engine ECU to control the engine speed to 880rpm, so that the GCU can control the clutch engagement. After the heat pump air conditioner is running, the RCU continues to calculate the reserve torque at the current engine speed combined with the SOC state according to the engine speed / torque curve table and the difference between the current engine actual speed and torque, and sends the target torque value to the IPU to charge the external battery pack. The RCU always controls the actual torque value not to exceed 90% of the maximum torque in the speed / torque curve to ensure the reliability of the engine operation.

[0042] By default, the system prioritizes the air conditioner, and the operating logic also satisfies the air conditioner operating load first. The whole machine controller RCU calculates the differential torque and feeds back the target torque signal to the IPU for charging. The charging time is affected by the air conditioner operating load and the state of the power battery pack SOC.

[0043] The utility model can utilize the idle period of the wide temperature range air source heat pump, and can even be equipped with a large standby power engine, to provide DC fast charging for new energy electric vehicles or power battery packs that need to be charged while ensuring cooling / heating. The use of this new wide temperature range air source heat pump system with DC charging pile can not only save the investment cost of newly built municipal power charging pile equipment, but also solve the problems of insufficient grid capacity, site restrictions, power shortage, etc. The DC fast charging provided can achieve a faster charging function.

Claims

1. A wide temperature range air source heat pump system with an electric vehicle charging pile, characterized by: The system includes a gas engine, a compressor, a condenser, an evaporator and a generator. The compressor and the generator are respectively connected to the gas engine, and the gas engine drives the compressor and the generator to work. The refrigerant output end of the compressor is connected to the condenser, the output end of the condenser is connected to the evaporator, and the output end of the evaporator is connected to the refrigerant input end of the compressor.

2. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: The generator and the compressor are connected in series, and the generator is connected between the compressor and the gas engine.

3. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: The generator is a permanent magnet generator.

4. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: The condenser adopts a plate heat exchanger or a tube-fin heat exchanger.

5. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: The evaporator adopts a plate heat exchanger or a tube-fin heat exchanger.

6. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: An electronic expansion valve is connected between the condenser and the evaporator.

7. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 1 is characterized in that: The cooling water system of the gas engine is connected with a waste heat recovery heat exchanger.

8. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 7 is characterized in that: The heat exchange water outlet of the condenser is connected to the water inlet of the waste heat recovery heat exchanger.

9. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 7 is characterized in that: The exhaust outlet of the gas engine is connected to a flue gas heat recovery device, the water outlet of the flue gas heat recovery device is connected to the water inlet of the cooling water system of the gas engine, and the water inlet of the flue gas heat recovery device is connected to the water outlet of the waste heat recovery heat exchanger.

10. The wide temperature range air source heat pump system with electric vehicle charging pile according to claim 7, characterized in that: The water outlet of the waste heat recovery heat exchanger is also connected to the cooling water inlet of the generator, and the cooling water outlet of the generator is connected to the cooling water inlet of the gas engine.

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